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add percentile handling to histogram

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This commit is contained in:
Sears Russell 2011-02-25 19:47:14 +00:00
parent aaafca31b6
commit 22802f72c3
2 changed files with 22 additions and 2 deletions
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20
stasis/util/histogram.h
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@ -113,6 +113,26 @@ static inline void stasis_histogram_pretty_print_64(stasis_histogram_64_t* a);
static inline void stasis_histogram_pretty_print_32(stasis_histogram_32_t* a);
void stasis_histograms_auto_dump(void);
double stasis_histogram_nth_percentile_64(stasis_histogram_64_t* a, int pctile) {
long sum = 0;
for(int i = 0; i < 64; i++) {
sum += a->buckets[i];
}
sum *= pctile;
sum /= 100;
long newsum = 0;
int i;
for(i = 0; i < 64; i++) {
newsum += a->buckets[i];
if(newsum >= sum) { break; }
}
long ret = 1;
for(int j = 0; j < i; j++) {
ret *= 2;
}
return ((double)ret)/1000000.0;
}
void stasis_histogram_pretty_print_64(stasis_histogram_64_t* a) {
uint8_t logs[64];
int max_log = 0;

4
stasis/util/time.h
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@ -32,7 +32,7 @@ static inline struct timespec stasis_double_to_timespec(double a) {
ts.tv_nsec = (long int)((a - (double)ts.tv_sec) * 1000000000.0);
return ts;
}
static uint8_t stasis_log_2_timeval(const struct timeval a) {
return stasis_log_2_64(a.tv_sec * 1000000 + a.tv_usec);
static inline uint8_t stasis_log_2_timeval(const struct timeval a) {
return stasis_log_2_64((a.tv_sec * 1000000 + a.tv_usec));
}
#endif /* TIME_H_ */